Journal
NANOSCALE RESEARCH LETTERS
Volume 14, Issue 1, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/s11671-019-3096-6
Keywords
Transition metal hydroxides; Ni(OH)(2); Nanocages; Coordinating etching and precipitating; Supercapacitor; Energy storage
Funding
- National Natural Science Foundation of China [21403020]
- Basic and Frontier Research Program of Chongqing Municipality [cstc2016jcyjAX0014, cstc2016jcyjA0148]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJ1601133, KJ1711269, KJ1711267]
- Foundation of Chong Qing University of Arts and Science [P2018cl07, M2017ME19, M2018ME04]
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Rational design of cage-like structure is an effective method for the improvement of the capacitive performance of transition metal hydroxides. In this work, cubic Ni(OH)2 nanocages (Ni(OH)2 NCs) were constructed through a coordinating etching and precipitating (CEP) route. Ni(OH)2 NCs possess abundant active sites, sufficient diffusion channels, and accelerated electron transfer rate, which are beneficial for electrochemical kinetics. As a positive electrode for supercapacitors, the Ni(OH)2 NCs/Ni foam (NF) electrode presents a high specific capacitance of 539.8 F g(-1) at 1 A g(-1), which is much larger than that of broken Ni(OH)2 NCs/NF (Ni(OH)2 BNCs/NF, 87.3 F g(-1) at 1 A g(-1)). In addition, the Ni(OH)2 NCs/NF electrode still retains 96.9% of its initial specific capacitance after 2000 cycles. The asymmetric supercapacitor (ASC) devices were assembled using Ni(OH)2 NCs/NF and activated carbon (AC)/NF as positive and negative electrodes, respectively. The ASC exhibits a higher energy density of 23.3 Wh kg(-1) at a power density of 800 W kg(-1) compared to Ni(OH)2 BNCs/NF (3 Wh kg(-1) at 880 W kg(-1)). These results demonstrate that the Ni(OH)2 NCs/NF electrode presents potential applications in the field of energy storage. The design of cage-like structure paves an effective way to achieve high-performance electrode materials.
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